Hydrangea plant named ‘HYLV18535’

ABSTRACT

A new and distinct cultivar of  Hydrangea  plant named ‘HYLV18535’, characterized by its relatively compact, upright to broadly spreading plant habit; moderately vigorous growth habit; freely branching habit; strong and sturdy stems; freely flowering habit; panicles with greenish white-colored sterile flowers that become red in color with subsequent development; and good garden performance.

Botanical designation: Hydrangea paniculata.

Cultivar denomination: ‘HYLV18535’.

CROSS-REFERENCED TO CLOSELY-RELATED APPLICATIONS

An European Community Plant Breeder's Rights application for this plant was filed by the Applicant/Assignee of the instant application, Kwekerij Lendert de Vos of Reeuwijk, The Netherlands on Jan. 25, 2022, application number 2022/0237. Foreign priority is not claimed to this European Plant Breeder's Rights application.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Hydrangea plant, botanically known as Hydrangea paniculata, commercially referred to as a Paniculated Hydrangea and hereinafter referred to by the name ‘HYLV18535’.

The new Hydrangea plant is a product of a planned breeding program conducted by the Inventor in Reeuwijk, The Netherlands. The objective of the breeding program is to create new compact and strong Hydrangea plants with attractive inflorescences and good postproduction longevity.

The new Hydrangea plant originated from an open-pollination during the summer of 2016 of a proprietary selection of Hydrangea paniculata identified as code number P13502, not patented, as the female, or seed, parent with an unknown selection of Hydrangea paniculata as the male, or pollen, parent. The new Hydrangea plant was discovered and selected as a single flowering plant from within the progeny of the stated open-pollination in a controlled greenhouse environment in Reeuwijk, The Netherlands in August, 2018.

Asexual reproduction of the new Hydrangea plant by terminal vegetative cuttings since August, 2018 in a controlled greenhouse environment in Reeuwijk, The Netherlands has shown that the unique features of this new Hydrangea plant are stable and reproduced true to type in successive generations of asexual reproduction.

SUMMARY OF THE NEW PLANT

Plants of the new Hydrangea have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘HYLV18535’. These characteristics in combination distinguish ‘HYLV18535’ as a new and distinct Hydrangea plant:

-   -   1. Relatively compact, upright to broadly spreading plant habit.     -   2. Moderately vigorous growth habit.     -   3. Freely branching habit.     -   4. Strong and sturdy stems.     -   5. Freely flowering habit.     -   6. Panicles with greenish white-colored sterile flowers that         become red in color with subsequent development.     -   7. Good garden performance.

Plants of the new Hydrangea can be compared to plants of the female parent selection. Plants of the new Hydrangea differ primarily from plants of the female parent selection in the following characteristics:

-   -   1. Plants of the new Hydrangea are more compact than plants of         the female parent selection.     -   2. Inflorescences of plants of the new Hydrangea are not as         dense as inflorescences of plants of the female parent         selection.

Plants of the new Hydrangea can be compared to plants of Hydrangea paniculata ‘Jane’, disclosed in U.S. Plant Pat. No. 22,330. In side-by-side comparisons, plants of the new Hydrangea differ primarily from plants of ‘Jane’ in the following characteristics:

-   -   1. Plants of the new Hydrangea are more upright than and not as         outwardly spreading as plants of ‘Jane’.     -   2. Plants of the new Hydrangea are denser than and not as open         as plants of ‘Jane’.     -   3. Stems of plants of the new Hydrangea are stronger than stems         of plants of ‘Jane’.     -   4. Inflorescences of plants of the new Hydrangea are not as         dense as inflorescences of plants of ‘Jane’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the unique appearance of the new Hydrangea plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ from the color values cited in the detailed botanical description which accurately describe the colors of the new Hydrangea plant.

The photograph on the first sheet (FIG. 1 ) is a side perspective view of a typical flowering plant of ‘HYLV18535’ grown in an outdoor nursery.

The photograph at the top of the second sheet (FIG. 2 ) is a close-up view of typical inflorescences of ‘HYLV18535’.

The photograph at the bottom of the second sheet (FIG. 3 ) is a close-up view of typical leaves of ‘HYLV18535’.

DETAILED BOTANICAL DESCRIPTION

Plants used in the aforementioned photographs and in the following description were grown during the late summer in ground beds in an outdoor nursery in Reeuwijk, The Netherlands and under cultural practices typical of commercial Hydrangea production. During the production of the plants, day temperatures ranged from 18° C. to 32° C., night temperatures ranged from 12° C. to 20° C. Plants of the new Hydrangea were pruned in the spring and pinched in the early summer. Plants were three years old when the photographs and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2015 Edition, except where general terms of ordinary dictionary significance are used. Paniculated Hydrangea plants are not typically treated with aluminum sulfate to “blue” the flower color.

-   Botanical description: Hydrangea paniculata ‘HYLV18535’. -   Parentage:     -   -   Female, or seed, patent.—Proprietary selection of Hydrangea             paniculata identified as code number P13502, not patented.         -   Male, or pollen, patent.—Unknown selection of Hydrangea             paniculata, not patented. -   Propagation:     -   -   Type cutting.—By vegetative terminal cuttings.         -   Time to initiate roots, summer.—About 16 days at             temperatures ranging from 20° C. to 30° C.         -   Time to produce a rooted young plant, summer.—About four             months at temperatures ranging from 20° C. to 30° C.         -   Root description.—Medium in thickness to thick; fibrous;             typically light brown in color, actual color of the roots is             dependent on substrate composition, water quality,             fertilizer type and formulation, substrate temperature and             physiological age of roots.         -   Rooting habit.—Freely branching; dense. -   Plant description:     -   -   Plant and growth habit.—Relatively compact; upright to             broadly outwardly spreading and mounding plant habit;             flattened broadly obovate in overall shape; strong and             sturdy stems; moderately vigorous growth habit and moderate             growth rate; about one year from propagation are required to             produce small finished plants.         -   Plant height.—About 47.5 cm.         -   Plant diameter or area of spread.—About 69.5 cm. -   Lateral branch description:     -   -   Branching habit.—Freely branching habit with about 32             lateral branches developing per plant; pinching is not             required, but will enhance lateral branch development.         -   Length.—About 26.4 cm.         -   Diameter.—About 4.5 mm.         -   Internode length.—About 5.1 cm.         -   Strength.—Strong, sturdy.         -   Aspect.—Erect to about 50° from vertical.         -   Texture.—Sparsely pubescent; becoming woody with subsequent             development.         -   Color, developing.—Close to 147C.         -   Color, fully developed.—Close to N199A, N199B and 200C; when             woody, close to 197B, 197C, 199C, N199B and 200C to 200D.         -   Lenticels.—Density: Sparse. Length: About 1 mm. Diameter:             About 0.5 mm. Color: Close to N199D. -   Leaf description:     -   -   Arrangement.—Opposite or in whorls of three, simple.         -   Length.—About 7.5 cm.         -   Width.—About 3.9 cm.         -   Shape.—Elliptic to close to ovate; moderately to strongly             carinate.         -   Apex.—Apiculate.         -   Base.—Attenuate to close to rounded.         -   Margin.—Senate.         -   Texture and luster, upper surface.—Sparsely pubescent;             matte.         -   Texture and luster, lower surface.—Sparsely pubescent;             slightly glossy.         -   Venation pattern.—Pinnate.         -   Color.—Developing leaves, upper surface: Close to a blend of             143A and 146A. Developing leaves, lower surface: Close to             146B. Fully developed leaves, upper surface: Close to             NN137B; venation, close to 152B. Fully developed leaves,             lower surface: Close to 147B; venation, close to 151D.         -   Petioles.—Length: About 1.1 cm. Diameter: About 1.75 mm.             Texture and luster, upper and lower surfaces: Sparsely             pubescent; slightly glossy. Color, upper surface: Close to             152B. Color, lower surface: Close to 146D. -   Flower description:     -   -   Flower type and habit.—Showy rotate sterile flowers and             small, inconspicuous rotate fertile flowers arranged on             terminal panicles; panicles irregular conical to broadly             conical in shape; sterile flowers face upright, outwardly to             drooping and fertile flowers face mostly upright.         -   Fragrance.—Faintly to moderately fragrant; sweet and             pleasant.         -   Natural flowering season.—In the garden, plants flower             continuously from the midsummer to late summer in The             Netherlands.         -   Flower longevity.—Good postproduction longevity; sterile             flowers maintain good substance for about six weeks on the             plant, sterile flowers persistent; fertile flowers last for             about five days on the plant, fertile flowers not             persistent.         -   Quantity of flowers.—Freely flowering habit; about 325             sterile flowers per panicle and about 440 fertile flowers             per panicle.         -   Panicle height.—About 16.4 cm.         -   Panicle diameter.—About 15 cm.         -   Panicle peduncles.—Length: About 15.2 cm. Diameter: About             3 mm. Strength: Moderately strong. Aspect: Primary             peduncles, mostly erect; lateral peduncles, about 50° from             primary peduncle axis. Texture: Sparsely pubescent. Color:             Close to 145C.         -   Sterile flower buds.—Length: About 6 mm. Diameter: About             1.2 cm. Shape: Broadly cup-shaped. Color: Close to a blend             of 150C and 154D.         -   Fertile flower buds.—Length: About 4 mm. Diameter: About             3 mm. Shape: Broadly obovate. Color: Immature corolla, close             to NN155A to NN155B; immature calyx, close to 157D.         -   Sterile flower diameter.—About 3 cm.         -   Sterile flower depth (height).—About 4 mm.         -   Fertile flower diameter.—About 8 mm.         -   Fertile flower depth (height).—About 7 mm.         -   Petals, sterile flowers.—Quantity and arrangement: Four in a             single whorl. Length: About 2.5 mm. Width: About 1.25 mm.             Shape: Narrowly ovate, concave. Apex: Acute. Base: Cuneate.             Margin: Entire. Texture and luster, upper surface: Smooth,             glabrous; moderately glossy. Texture and luster, lower             surface: Smooth, glabrous; slightly glossy. Color: When             opening and fully opened, upper surface: Close to NN155D;             color does not change with subsequent development. When             opening and fully opened, lower surface: Close to NN155D;             color does not change with subsequent development.         -   Petals, fertile flowers.—Quantity and arrangement: Five in a             single whorl. Length: About 3 mm. Width: About 1.5 mm.             Shape: Ovate, slightly to moderately concave. Apex: Acute.             Base: Cuneate. Margin: Entire. Texture and luster, upper             surface: Smooth, glabrous; moderately glossy. Texture and             luster, lower surface: Smooth, glabrous; slightly glossy.             Color: When opening and fully opened, upper surface: Close             to a blend of NN155D and 157D; color does not change with             subsequent development. When opening and fully opened, lower             surface: Close to a blend of NN155D and 157D; color does not             change with subsequent development.         -   Sepals, sterile flowers.—Quantity and arrangement: Typically             four, or occasionally three or five, arranged in a single             whorl. Length: About 1.7 cm. Width: About 9.5 mm. Shape:             Obovate to narrowly obovate to elliptic. Apex: Obtuse. Base:             Narrowly cuneate. Margin: Entire. Texture and luster, upper             and lower surfaces: Smooth, glabrous; matte. Color: When             opening, upper and lower surfaces: Close to 150D. Fully             opened, upper surface: Close to a blend of 150D and 157A;             towards the apex, slightly tinged with close to 181D; with             subsequent development, color becoming closer to 181B and             181C. Fully opened, lower surface: Close to 157B; towards             the margins and apex, slightly tinged with close to 181D;             with subsequent development, color becoming closer to 148C             and 148D and towards the margins, close to 181C.         -   Sepals, fertile flowers.—Quantity and arrangement: Five in a             single whorl. Length: About 1 mm. Width: About 1.25 mm.             Shape: Broadly deltoid. Apex: Broadly acuminate. Base:             Broadly cuneate. Margin: Entire. Texture and luster, upper             and lower surfaces: Smooth, glabrous; matte. Color: When             opening and fully opened, upper surface: Close to 157C;             color does not change with subsequent development. When             opening and fully opened, lower surface: Close to 157C;             color does not change with subsequent development.         -   Pedicels, sterile flowers.—Length: About 2.2 cm. Diameter:             About 0.8 mm. Strength: Moderately strong. Aspect: About 30°             to 60° from main peduncle axis. Texture and luster:             Moderately to densely pubescent; matte. Color: Close to             157C.         -   Pedicels, fertile flowers.—Length: About 5 mm. Diameter:             About 0.75 mm. Strength: Moderately strong. Aspect: About             30° from vertical. Texture and luster: Moderately pubescent;             matte. Color: Close to 157D.         -   Reproductive organs, sterile flowers.—Stamens: Quantity per             flower: Eight. Filament length: About 2 mm. Filament color:             Close to 155C. Anther shape: Oblong. Anther length: About             0.5 mm. Anther color: Close to 158D. Pollen amount: Scarce.             Pollen color: Close to 155D. Pistils: Pistil quantity per             flower: One; deformed. Pistil length: About 1 mm. Stigma             shape: Pointed. Stigma color: Close to 155A. Style length:             About 0.5 mm. Style color: Close to 154C to 154D. Ovary             color: Close to 145C.         -   Reproductive organs, fertile flowers.—Stamens: Quantity per             flower: Ten. Filament length: About 4.5 mm. Filament color:             Close to NN155D. Anther shape: Oblong. Anther length: About             0.5 mm. Anther color: Close to 158D. Pollen amount: Scarce.             Pollen color: Close to 155D. Pistils: Pistil quantity per             flower: Two or occasionally, three. Pistil length: About             1.5 mm. Stigma shape: Club-shaped. Stigma color: Close to             155C. Style length: About 0.5 mm. Style color: Close to             145D. Ovary color: Close to 147D.         -   Seeds.—To date, seed development has not been observed on             plants of the new Hydrangea. -   Pathogen & pest resistance: Plants of the new Hydrangea have not     been observed to be resistant to pathogens and pests common to     Hydrangea plants. -   Temperature tolerance: Plants of the new Hydrangea have been shown     to be suitable for USDA Hardiness Zones 5 through 9. 

It is claimed:
 1. A new and distinct Hydrangea plant named ‘HYLV18535’ as illustrated and described. 